Part of brushes for cosmetic treatments



FIG. 1 is a front perspective view of the part of brushes for cosmetic treatments;

FIG. 2 is a rear view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a right side view thereof.

The broken lines are included for the purpose of illustrating environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for part of brushes for cosmetic treatments, as shown and described. 